Question: What is total assets of OJSC Russian Railways in 2015?
Paraphrase: What is sum assets of OJSC Russian Railways in 2015?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q660770 p:P2403 ?s . ?s ps:P2403 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2015')) }